..To estimate the relative rates of dementia in initially nondemented subjects with and without memory impairment defined by baseline free recall from the Free and Cued Selective Reminding (FCSR) test...

..Although age, education, and gender influenced FCSR performance, race did not. The study suggests that memory performance is not influenced by race and that race-adjustment may not be necessary in the norming of memory tests...

The relative frequency of "dementia of unknown etiology" increases with age and is nearly 50% in nonagenarians